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linux-zen-server/drivers/usb/host/ehci-hub.c

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Initial commit
2023-08-30 17:53:23 +02:00
// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2001-2004 by David Brownell
*/
/* this file is part of ehci-hcd.c */
/*-------------------------------------------------------------------------*/
/*
* EHCI Root Hub ... the nonsharable stuff
*
* Registers don't need cpu_to_le32, that happens transparently
*/
/*-------------------------------------------------------------------------*/
#define PORT_WAKE_BITS (PORT_WKOC_E|PORT_WKDISC_E|PORT_WKCONN_E)
#ifdef CONFIG_PM
static void unlink_empty_async_suspended(struct ehci_hcd *ehci);
static int persist_enabled_on_companion(struct usb_device *udev, void *unused)
{
return !udev->maxchild && udev->persist_enabled &&
udev->bus->root_hub->speed < USB_SPEED_HIGH;
}
/* After a power loss, ports that were owned by the companion must be
* reset so that the companion can still own them.
*/
static void ehci_handover_companion_ports(struct ehci_hcd *ehci)
{
u32 __iomem *reg;
u32 status;
int port;
__le32 buf;
struct usb_hcd *hcd = ehci_to_hcd(ehci);
if (!ehci->owned_ports)
return;
/*
* USB 1.1 devices are mostly HIDs, which don't need to persist across
* suspends. If we ensure that none of our companion's devices have
* persist_enabled (by looking through all USB 1.1 buses in the system),
* we can skip this and avoid slowing resume down. Devices without
* persist will just get reenumerated shortly after resume anyway.
*/
if (!usb_for_each_dev(NULL, persist_enabled_on_companion))
return;
/* Make sure the ports are powered */
port = HCS_N_PORTS(ehci->hcs_params);
while (port--) {
if (test_bit(port, &ehci->owned_ports)) {
reg = &ehci->regs->port_status[port];
status = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
if (!(status & PORT_POWER))
ehci_port_power(ehci, port, true);
}
}
/* Give the connections some time to appear */
msleep(20);
spin_lock_irq(&ehci->lock);
port = HCS_N_PORTS(ehci->hcs_params);
while (port--) {
if (test_bit(port, &ehci->owned_ports)) {
reg = &ehci->regs->port_status[port];
status = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
/* Port already owned by companion? */
if (status & PORT_OWNER)
clear_bit(port, &ehci->owned_ports);
else if (test_bit(port, &ehci->companion_ports))
ehci_writel(ehci, status & ~PORT_PE, reg);
else {
spin_unlock_irq(&ehci->lock);
ehci_hub_control(hcd, SetPortFeature,
USB_PORT_FEAT_RESET, port + 1,
NULL, 0);
spin_lock_irq(&ehci->lock);
}
}
}
spin_unlock_irq(&ehci->lock);
if (!ehci->owned_ports)
return;
msleep(90); /* Wait for resets to complete */
spin_lock_irq(&ehci->lock);
port = HCS_N_PORTS(ehci->hcs_params);
while (port--) {
if (test_bit(port, &ehci->owned_ports)) {
spin_unlock_irq(&ehci->lock);
ehci_hub_control(hcd, GetPortStatus,
0, port + 1,
(char *) &buf, sizeof(buf));
spin_lock_irq(&ehci->lock);
/* The companion should now own the port,
* but if something went wrong the port must not
* remain enabled.
*/
reg = &ehci->regs->port_status[port];
status = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
if (status & PORT_OWNER)
ehci_writel(ehci, status | PORT_CSC, reg);
else {
ehci_dbg(ehci, "failed handover port %d: %x\n",
port + 1, status);
ehci_writel(ehci, status & ~PORT_PE, reg);
}
}
}
ehci->owned_ports = 0;
spin_unlock_irq(&ehci->lock);
}
static int ehci_port_change(struct ehci_hcd *ehci)
{
int i = HCS_N_PORTS(ehci->hcs_params);
/* First check if the controller indicates a change event */
if (ehci_readl(ehci, &ehci->regs->status) & STS_PCD)
return 1;
/*
* Not all controllers appear to update this while going from D3 to D0,
* so check the individual port status registers as well
*/
while (i--)
if (ehci_readl(ehci, &ehci->regs->port_status[i]) & PORT_CSC)
return 1;
return 0;
}
void ehci_adjust_port_wakeup_flags(struct ehci_hcd *ehci,
bool suspending, bool do_wakeup)
{
int port;
u32 temp;
/* If remote wakeup is enabled for the root hub but disabled
* for the controller, we must adjust all the port wakeup flags
* when the controller is suspended or resumed. In all other
* cases they don't need to be changed.
*/
if (!ehci_to_hcd(ehci)->self.root_hub->do_remote_wakeup || do_wakeup)
return;
spin_lock_irq(&ehci->lock);
/* clear phy low-power mode before changing wakeup flags */
if (ehci->has_tdi_phy_lpm) {
port = HCS_N_PORTS(ehci->hcs_params);
while (port--) {
u32 __iomem *hostpc_reg = &ehci->regs->hostpc[port];
temp = ehci_readl(ehci, hostpc_reg);
ehci_writel(ehci, temp & ~HOSTPC_PHCD, hostpc_reg);
}
spin_unlock_irq(&ehci->lock);
msleep(5);
spin_lock_irq(&ehci->lock);
}
port = HCS_N_PORTS(ehci->hcs_params);
while (port--) {
u32 __iomem *reg = &ehci->regs->port_status[port];
u32 t1 = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
u32 t2 = t1 & ~PORT_WAKE_BITS;
/* If we are suspending the controller, clear the flags.
* If we are resuming the controller, set the wakeup flags.
*/
if (!suspending) {
if (t1 & PORT_CONNECT)
t2 |= PORT_WKOC_E | PORT_WKDISC_E;
else
t2 |= PORT_WKOC_E | PORT_WKCONN_E;
}
ehci_writel(ehci, t2, reg);
}
/* enter phy low-power mode again */
if (ehci->has_tdi_phy_lpm) {
port = HCS_N_PORTS(ehci->hcs_params);
while (port--) {
u32 __iomem *hostpc_reg = &ehci->regs->hostpc[port];
temp = ehci_readl(ehci, hostpc_reg);
ehci_writel(ehci, temp | HOSTPC_PHCD, hostpc_reg);
}
}
/* Does the root hub have a port wakeup pending? */
if (!suspending && ehci_port_change(ehci))
usb_hcd_resume_root_hub(ehci_to_hcd(ehci));
spin_unlock_irq(&ehci->lock);
}
EXPORT_SYMBOL_GPL(ehci_adjust_port_wakeup_flags);
static int ehci_bus_suspend (struct usb_hcd *hcd)
{
struct ehci_hcd *ehci = hcd_to_ehci (hcd);
int port;
int mask;
int changed;
bool fs_idle_delay;
ehci_dbg(ehci, "suspend root hub\n");
if (time_before (jiffies, ehci->next_statechange))
msleep(5);
/* stop the schedules */
ehci_quiesce(ehci);
spin_lock_irq (&ehci->lock);
if (ehci->rh_state < EHCI_RH_RUNNING)
goto done;
/* Once the controller is stopped, port resumes that are already
* in progress won't complete. Hence if remote wakeup is enabled
* for the root hub and any ports are in the middle of a resume or
* remote wakeup, we must fail the suspend.
*/
if (hcd->self.root_hub->do_remote_wakeup) {
if (ehci->resuming_ports) {
spin_unlock_irq(&ehci->lock);
ehci_dbg(ehci, "suspend failed because a port is resuming\n");
return -EBUSY;
}
}
/* Unlike other USB host controller types, EHCI doesn't have
* any notion of "global" or bus-wide suspend. The driver has
* to manually suspend all the active unsuspended ports, and
* then manually resume them in the bus_resume() routine.
*/
ehci->bus_suspended = 0;
ehci->owned_ports = 0;
changed = 0;
fs_idle_delay = false;
port = HCS_N_PORTS(ehci->hcs_params);
while (port--) {
u32 __iomem *reg = &ehci->regs->port_status [port];
u32 t1 = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
u32 t2 = t1 & ~PORT_WAKE_BITS;
/* keep track of which ports we suspend */
if (t1 & PORT_OWNER)
set_bit(port, &ehci->owned_ports);
else if ((t1 & PORT_PE) && !(t1 & PORT_SUSPEND)) {
t2 |= PORT_SUSPEND;
set_bit(port, &ehci->bus_suspended);
}
/* enable remote wakeup on all ports, if told to do so */
if (hcd->self.root_hub->do_remote_wakeup) {
/* only enable appropriate wake bits, otherwise the
* hardware can not go phy low power mode. If a race
* condition happens here(connection change during bits
* set), the port change detection will finally fix it.
*/
if (t1 & PORT_CONNECT)
t2 |= PORT_WKOC_E | PORT_WKDISC_E;
else
t2 |= PORT_WKOC_E | PORT_WKCONN_E;
}
if (t1 != t2) {
/*
* On some controllers, Wake-On-Disconnect will
* generate false wakeup signals until the bus
* switches over to full-speed idle. For their
* sake, add a delay if we need one.
*/
if ((t2 & PORT_WKDISC_E) &&
ehci_port_speed(ehci, t2) ==
USB_PORT_STAT_HIGH_SPEED)
fs_idle_delay = true;
ehci_writel(ehci, t2, reg);
changed = 1;
}
}
spin_unlock_irq(&ehci->lock);
if (changed && ehci_has_fsl_susp_errata(ehci))
/*
* Wait for at least 10 millisecondes to ensure the controller
* enter the suspend status before initiating a port resume
* using the Force Port Resume bit (Not-EHCI compatible).
*/
usleep_range(10000, 20000);
if ((changed && ehci->has_tdi_phy_lpm) || fs_idle_delay) {
/*
* Wait for HCD to enter low-power mode or for the bus
* to switch to full-speed idle.
*/
usleep_range(5000, 5500);
}
if (changed && ehci->has_tdi_phy_lpm) {
spin_lock_irq(&ehci->lock);
port = HCS_N_PORTS(ehci->hcs_params);
while (port--) {
u32 __iomem *hostpc_reg = &ehci->regs->hostpc[port];
u32 t3;
t3 = ehci_readl(ehci, hostpc_reg);
ehci_writel(ehci, t3 | HOSTPC_PHCD, hostpc_reg);
t3 = ehci_readl(ehci, hostpc_reg);
ehci_dbg(ehci, "Port %d phy low-power mode %s\n",
port, (t3 & HOSTPC_PHCD) ?
"succeeded" : "failed");
}
spin_unlock_irq(&ehci->lock);
}
/* Apparently some devices need a >= 1-uframe delay here */
if (ehci->bus_suspended)
udelay(150);
/* turn off now-idle HC */
ehci_halt (ehci);
spin_lock_irq(&ehci->lock);
if (ehci->enabled_hrtimer_events & BIT(EHCI_HRTIMER_POLL_DEAD))
ehci_handle_controller_death(ehci);
if (ehci->rh_state != EHCI_RH_RUNNING)
goto done;
ehci->rh_state = EHCI_RH_SUSPENDED;
unlink_empty_async_suspended(ehci);
/* Some Synopsys controllers mistakenly leave IAA turned on */
ehci_writel(ehci, STS_IAA, &ehci->regs->status);
/* Any IAA cycle that started before the suspend is now invalid */
end_iaa_cycle(ehci);
ehci_handle_start_intr_unlinks(ehci);
ehci_handle_intr_unlinks(ehci);
end_free_itds(ehci);
/* allow remote wakeup */
mask = INTR_MASK;
if (!hcd->self.root_hub->do_remote_wakeup)
mask &= ~STS_PCD;
ehci_writel(ehci, mask, &ehci->regs->intr_enable);
ehci_readl(ehci, &ehci->regs->intr_enable);
done:
ehci->next_statechange = jiffies + msecs_to_jiffies(10);
ehci->enabled_hrtimer_events = 0;
ehci->next_hrtimer_event = EHCI_HRTIMER_NO_EVENT;
spin_unlock_irq (&ehci->lock);
hrtimer_cancel(&ehci->hrtimer);
return 0;
}
/* caller has locked the root hub, and should reset/reinit on error */
static int ehci_bus_resume (struct usb_hcd *hcd)
{
struct ehci_hcd *ehci = hcd_to_ehci (hcd);
u32 temp;
u32 power_okay;
int i;
unsigned long resume_needed = 0;
if (time_before (jiffies, ehci->next_statechange))
msleep(5);
spin_lock_irq (&ehci->lock);
if (!HCD_HW_ACCESSIBLE(hcd) || ehci->shutdown)
goto shutdown;
if (unlikely(ehci->debug)) {
if (!dbgp_reset_prep(hcd))
ehci->debug = NULL;
else
dbgp_external_startup(hcd);
}
/* Ideally and we've got a real resume here, and no port's power
* was lost. (For PCI, that means Vaux was maintained.) But we
* could instead be restoring a swsusp snapshot -- so that BIOS was
* the last user of the controller, not reset/pm hardware keeping
* state we gave to it.
*/
power_okay = ehci_readl(ehci, &ehci->regs->intr_enable);
ehci_dbg(ehci, "resume root hub%s\n",
power_okay ? "" : " after power loss");
/* at least some APM implementations will try to deliver
* IRQs right away, so delay them until we're ready.
*/
ehci_writel(ehci, 0, &ehci->regs->intr_enable);
/* re-init operational registers */
ehci_writel(ehci, 0, &ehci->regs->segment);
ehci_writel(ehci, ehci->periodic_dma, &ehci->regs->frame_list);
ehci_writel(ehci, (u32) ehci->async->qh_dma, &ehci->regs->async_next);
/* restore CMD_RUN, framelist size, and irq threshold */
ehci->command |= CMD_RUN;
ehci_writel(ehci, ehci->command, &ehci->regs->command);
ehci->rh_state = EHCI_RH_RUNNING;
/*
* According to Bugzilla #8190, the port status for some controllers
* will be wrong without a delay. At their wrong status, the port
* is enabled, but not suspended neither resumed.
*/
i = HCS_N_PORTS(ehci->hcs_params);
while (i--) {
temp = ehci_readl(ehci, &ehci->regs->port_status[i]);
if ((temp & PORT_PE) &&
!(temp & (PORT_SUSPEND | PORT_RESUME))) {
ehci_dbg(ehci, "Port status(0x%x) is wrong\n", temp);
spin_unlock_irq(&ehci->lock);
msleep(8);
spin_lock_irq(&ehci->lock);
break;
}
}
if (ehci->shutdown)
goto shutdown;
/* clear phy low-power mode before resume */
if (ehci->bus_suspended && ehci->has_tdi_phy_lpm) {
i = HCS_N_PORTS(ehci->hcs_params);
while (i--) {
if (test_bit(i, &ehci->bus_suspended)) {
u32 __iomem *hostpc_reg =
&ehci->regs->hostpc[i];
temp = ehci_readl(ehci, hostpc_reg);
ehci_writel(ehci, temp & ~HOSTPC_PHCD,
hostpc_reg);
}
}
spin_unlock_irq(&ehci->lock);
msleep(5);
spin_lock_irq(&ehci->lock);
if (ehci->shutdown)
goto shutdown;
}
/* manually resume the ports we suspended during bus_suspend() */
i = HCS_N_PORTS (ehci->hcs_params);
while (i--) {
temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
temp &= ~(PORT_RWC_BITS | PORT_WAKE_BITS);
if (test_bit(i, &ehci->bus_suspended) &&
(temp & PORT_SUSPEND)) {
temp |= PORT_RESUME;
set_bit(i, &resume_needed);
}
ehci_writel(ehci, temp, &ehci->regs->port_status [i]);
}
/*
* msleep for USB_RESUME_TIMEOUT ms only if code is trying to resume
* port
*/
if (resume_needed) {
spin_unlock_irq(&ehci->lock);
msleep(USB_RESUME_TIMEOUT);
spin_lock_irq(&ehci->lock);
if (ehci->shutdown)
goto shutdown;
}
i = HCS_N_PORTS (ehci->hcs_params);
while (i--) {
temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
if (test_bit(i, &resume_needed)) {
temp &= ~(PORT_RWC_BITS | PORT_SUSPEND | PORT_RESUME);
ehci_writel(ehci, temp, &ehci->regs->port_status [i]);
}
}
ehci->next_statechange = jiffies + msecs_to_jiffies(5);
spin_unlock_irq(&ehci->lock);
ehci_handover_companion_ports(ehci);
/* Now we can safely re-enable irqs */
spin_lock_irq(&ehci->lock);
if (ehci->shutdown)
goto shutdown;
ehci_writel(ehci, INTR_MASK, &ehci->regs->intr_enable);
(void) ehci_readl(ehci, &ehci->regs->intr_enable);
spin_unlock_irq(&ehci->lock);
return 0;
shutdown:
spin_unlock_irq(&ehci->lock);
return -ESHUTDOWN;
}
static unsigned long ehci_get_resuming_ports(struct usb_hcd *hcd)
{
struct ehci_hcd *ehci = hcd_to_ehci(hcd);
return ehci->resuming_ports;
}
#else
#define ehci_bus_suspend NULL
#define ehci_bus_resume NULL
#define ehci_get_resuming_ports NULL
#endif /* CONFIG_PM */
/*-------------------------------------------------------------------------*/
/*
* Sets the owner of a port
*/
static void set_owner(struct ehci_hcd *ehci, int portnum, int new_owner)
{
u32 __iomem *status_reg;
u32 port_status;
int try;
status_reg = &ehci->regs->port_status[portnum];
/*
* The controller won't set the OWNER bit if the port is
* enabled, so this loop will sometimes require at least two
* iterations: one to disable the port and one to set OWNER.
*/
for (try = 4; try > 0; --try) {
spin_lock_irq(&ehci->lock);
port_status = ehci_readl(ehci, status_reg);
if ((port_status & PORT_OWNER) == new_owner
|| (port_status & (PORT_OWNER | PORT_CONNECT))
== 0)
try = 0;
else {
port_status ^= PORT_OWNER;
port_status &= ~(PORT_PE | PORT_RWC_BITS);
ehci_writel(ehci, port_status, status_reg);
}
spin_unlock_irq(&ehci->lock);
if (try > 1)
msleep(5);
}
}
/*-------------------------------------------------------------------------*/
static int check_reset_complete (
struct ehci_hcd *ehci,
int index,
u32 __iomem *status_reg,
int port_status
) {
if (!(port_status & PORT_CONNECT))
return port_status;
/* if reset finished and it's still not enabled -- handoff */
if (!(port_status & PORT_PE)) {
/* with integrated TT, there's nobody to hand it to! */
if (ehci_is_TDI(ehci)) {
ehci_dbg (ehci,
"Failed to enable port %d on root hub TT\n",
index+1);
return port_status;
}
ehci_dbg (ehci, "port %d full speed --> companion\n",
index + 1);
// what happens if HCS_N_CC(params) == 0 ?
port_status |= PORT_OWNER;
port_status &= ~PORT_RWC_BITS;
ehci_writel(ehci, port_status, status_reg);
/* ensure 440EPX ohci controller state is operational */
if (ehci->has_amcc_usb23)
set_ohci_hcfs(ehci, 1);
} else {
ehci_dbg(ehci, "port %d reset complete, port enabled\n",
index + 1);
/* ensure 440EPx ohci controller state is suspended */
if (ehci->has_amcc_usb23)
set_ohci_hcfs(ehci, 0);
}
return port_status;
}
/*-------------------------------------------------------------------------*/
/* build "status change" packet (one or two bytes) from HC registers */
static int
ehci_hub_status_data (struct usb_hcd *hcd, char *buf)
{
struct ehci_hcd *ehci = hcd_to_ehci (hcd);
u32 temp, status;
u32 mask;
int ports, i, retval = 1;
unsigned long flags;
u32 ppcd = ~0;
/* init status to no-changes */
buf [0] = 0;
ports = HCS_N_PORTS (ehci->hcs_params);
if (ports > 7) {
buf [1] = 0;
retval++;
}
/* Inform the core about resumes-in-progress by returning
* a non-zero value even if there are no status changes.
*/
status = ehci->resuming_ports;
/* Some boards (mostly VIA?) report bogus overcurrent indications,
* causing massive log spam unless we completely ignore them. It
* may be relevant that VIA VT8235 controllers, where PORT_POWER is
* always set, seem to clear PORT_OCC and PORT_CSC when writing to
* PORT_POWER; that's surprising, but maybe within-spec.
*/
if (!ignore_oc && !ehci->spurious_oc)
mask = PORT_CSC | PORT_PEC | PORT_OCC;
else
mask = PORT_CSC | PORT_PEC;
// PORT_RESUME from hardware ~= PORT_STAT_C_SUSPEND
/* no hub change reports (bit 0) for now (power, ...) */
/* port N changes (bit N)? */
spin_lock_irqsave (&ehci->lock, flags);
/* get per-port change detect bits */
if (ehci->has_ppcd)
ppcd = ehci_readl(ehci, &ehci->regs->status) >> 16;
for (i = 0; i < ports; i++) {
/* leverage per-port change bits feature */
if (ppcd & (1 << i))
temp = ehci_readl(ehci, &ehci->regs->port_status[i]);
else
temp = 0;
/*
* Return status information even for ports with OWNER set.
* Otherwise hub_wq wouldn't see the disconnect event when a
* high-speed device is switched over to the companion
* controller by the user.
*/
if ((temp & mask) != 0 || test_bit(i, &ehci->port_c_suspend)
|| (ehci->reset_done[i] && time_after_eq(
jiffies, ehci->reset_done[i]))) {
if (i < 7)
buf [0] |= 1 << (i + 1);
else
buf [1] |= 1 << (i - 7);
status = STS_PCD;
}
}
/* If a resume is in progress, make sure it can finish */
if (ehci->resuming_ports)
mod_timer(&hcd->rh_timer, jiffies + msecs_to_jiffies(25));
spin_unlock_irqrestore (&ehci->lock, flags);
return status ? retval : 0;
}
/*-------------------------------------------------------------------------*/
static void
ehci_hub_descriptor (
struct ehci_hcd *ehci,
struct usb_hub_descriptor *desc
) {
int ports = HCS_N_PORTS (ehci->hcs_params);
u16 temp;
desc->bDescriptorType = USB_DT_HUB;
desc->bPwrOn2PwrGood = 10; /* ehci 1.0, 2.3.9 says 20ms max */
desc->bHubContrCurrent = 0;
desc->bNbrPorts = ports;
temp = 1 + (ports / 8);
desc->bDescLength = 7 + 2 * temp;
/* two bitmaps: ports removable, and usb 1.0 legacy PortPwrCtrlMask */
memset(&desc->u.hs.DeviceRemovable[0], 0, temp);
memset(&desc->u.hs.DeviceRemovable[temp], 0xff, temp);
temp = HUB_CHAR_INDV_PORT_OCPM; /* per-port overcurrent reporting */
if (HCS_PPC (ehci->hcs_params))
temp |= HUB_CHAR_INDV_PORT_LPSM; /* per-port power control */
else
temp |= HUB_CHAR_NO_LPSM; /* no power switching */
#if 0
// re-enable when we support USB_PORT_FEAT_INDICATOR below.
if (HCS_INDICATOR (ehci->hcs_params))
temp |= HUB_CHAR_PORTIND; /* per-port indicators (LEDs) */
#endif
desc->wHubCharacteristics = cpu_to_le16(temp);
}
/*-------------------------------------------------------------------------*/
int ehci_hub_control(
struct usb_hcd *hcd,
u16 typeReq,
u16 wValue,
u16 wIndex,
char *buf,
u16 wLength
) {
struct ehci_hcd *ehci = hcd_to_ehci (hcd);
int ports = HCS_N_PORTS (ehci->hcs_params);
u32 __iomem *status_reg, *hostpc_reg;
u32 temp, temp1, status;
unsigned long flags;
int retval = 0;
unsigned selector;
/*
* Avoid out-of-bounds values while calculating the port index
* from wIndex. The compiler doesn't like pointers to invalid
* addresses, even if they are never used.
*/
temp = (wIndex - 1) & 0xff;
if (temp >= HCS_N_PORTS_MAX)
temp = 0;
status_reg = &ehci->regs->port_status[temp];
hostpc_reg = &ehci->regs->hostpc[temp];
/*
* FIXME: support SetPortFeatures USB_PORT_FEAT_INDICATOR.
* HCS_INDICATOR may say we can change LEDs to off/amber/green.
* (track current state ourselves) ... blink for diagnostics,
* power, "this is the one", etc. EHCI spec supports this.
*/
spin_lock_irqsave (&ehci->lock, flags);
switch (typeReq) {
case ClearHubFeature:
switch (wValue) {
case C_HUB_LOCAL_POWER:
case C_HUB_OVER_CURRENT:
/* no hub-wide feature/status flags */
break;
default:
goto error;
}
break;
case ClearPortFeature:
if (!wIndex || wIndex > ports)
goto error;
wIndex--;
temp = ehci_readl(ehci, status_reg);
temp &= ~PORT_RWC_BITS;
/*
* Even if OWNER is set, so the port is owned by the
* companion controller, hub_wq needs to be able to clear
* the port-change status bits (especially
* USB_PORT_STAT_C_CONNECTION).
*/
switch (wValue) {
case USB_PORT_FEAT_ENABLE:
ehci_writel(ehci, temp & ~PORT_PE, status_reg);
break;
case USB_PORT_FEAT_C_ENABLE:
ehci_writel(ehci, temp | PORT_PEC, status_reg);
break;
case USB_PORT_FEAT_SUSPEND:
if (temp & PORT_RESET)
goto error;
if (ehci->no_selective_suspend)
break;
#ifdef CONFIG_USB_OTG
if ((hcd->self.otg_port == (wIndex + 1))
&& hcd->self.b_hnp_enable) {
otg_start_hnp(hcd->usb_phy->otg);
break;
}
#endif
if (!(temp & PORT_SUSPEND))
break;
if ((temp & PORT_PE) == 0)
goto error;
/* clear phy low-power mode before resume */
if (ehci->has_tdi_phy_lpm) {
temp1 = ehci_readl(ehci, hostpc_reg);
ehci_writel(ehci, temp1 & ~HOSTPC_PHCD,
hostpc_reg);
spin_unlock_irqrestore(&ehci->lock, flags);
msleep(5);/* wait to leave low-power mode */
spin_lock_irqsave(&ehci->lock, flags);
}
/* resume signaling for 20 msec */
temp &= ~PORT_WAKE_BITS;
ehci_writel(ehci, temp | PORT_RESUME, status_reg);
ehci->reset_done[wIndex] = jiffies
+ msecs_to_jiffies(USB_RESUME_TIMEOUT);
set_bit(wIndex, &ehci->resuming_ports);
usb_hcd_start_port_resume(&hcd->self, wIndex);
break;
case USB_PORT_FEAT_C_SUSPEND:
clear_bit(wIndex, &ehci->port_c_suspend);
break;
case USB_PORT_FEAT_POWER:
if (HCS_PPC(ehci->hcs_params)) {
spin_unlock_irqrestore(&ehci->lock, flags);
ehci_port_power(ehci, wIndex, false);
spin_lock_irqsave(&ehci->lock, flags);
}
break;
case USB_PORT_FEAT_C_CONNECTION:
ehci_writel(ehci, temp | PORT_CSC, status_reg);
break;
case USB_PORT_FEAT_C_OVER_CURRENT:
ehci_writel(ehci, temp | PORT_OCC, status_reg);
break;
case USB_PORT_FEAT_C_RESET:
/* GetPortStatus clears reset */
break;
default:
goto error;
}
ehci_readl(ehci, &ehci->regs->command); /* unblock posted write */
break;
case GetHubDescriptor:
ehci_hub_descriptor (ehci, (struct usb_hub_descriptor *)
buf);
break;
case GetHubStatus:
/* no hub-wide feature/status flags */
memset (buf, 0, 4);
//cpu_to_le32s ((u32 *) buf);
break;
case GetPortStatus:
if (!wIndex || wIndex > ports)
goto error;
wIndex--;
status = 0;
temp = ehci_readl(ehci, status_reg);
// wPortChange bits
if (temp & PORT_CSC)
status |= USB_PORT_STAT_C_CONNECTION << 16;
if (temp & PORT_PEC)
status |= USB_PORT_STAT_C_ENABLE << 16;
if ((temp & PORT_OCC) && (!ignore_oc && !ehci->spurious_oc)){
status |= USB_PORT_STAT_C_OVERCURRENT << 16;
/*
* Hubs should disable port power on over-current.
* However, not all EHCI implementations do this
* automatically, even if they _do_ support per-port
* power switching; they're allowed to just limit the
* current. hub_wq will turn the power back on.
*/
if (((temp & PORT_OC) || (ehci->need_oc_pp_cycle))
&& HCS_PPC(ehci->hcs_params)) {
spin_unlock_irqrestore(&ehci->lock, flags);
ehci_port_power(ehci, wIndex, false);
spin_lock_irqsave(&ehci->lock, flags);
temp = ehci_readl(ehci, status_reg);
}
}
/* no reset or resume pending */
if (!ehci->reset_done[wIndex]) {
/* Remote Wakeup received? */
if (temp & PORT_RESUME) {
/* resume signaling for 20 msec */
ehci->reset_done[wIndex] = jiffies
+ msecs_to_jiffies(20);
usb_hcd_start_port_resume(&hcd->self, wIndex);
set_bit(wIndex, &ehci->resuming_ports);
/* check the port again */
mod_timer(&ehci_to_hcd(ehci)->rh_timer,
ehci->reset_done[wIndex]);
}
/* reset or resume not yet complete */
} else if (!time_after_eq(jiffies, ehci->reset_done[wIndex])) {
; /* wait until it is complete */
/* resume completed */
} else if (test_bit(wIndex, &ehci->resuming_ports)) {
clear_bit(wIndex, &ehci->suspended_ports);
set_bit(wIndex, &ehci->port_c_suspend);
ehci->reset_done[wIndex] = 0;
usb_hcd_end_port_resume(&hcd->self, wIndex);
/* stop resume signaling */
temp &= ~(PORT_RWC_BITS | PORT_SUSPEND | PORT_RESUME);
ehci_writel(ehci, temp, status_reg);
clear_bit(wIndex, &ehci->resuming_ports);
retval = ehci_handshake(ehci, status_reg,
PORT_RESUME, 0, 2000 /* 2msec */);
if (retval != 0) {
ehci_err(ehci, "port %d resume error %d\n",
wIndex + 1, retval);
goto error;
}
temp = ehci_readl(ehci, status_reg);
/* whoever resets must GetPortStatus to complete it!! */
} else {
status |= USB_PORT_STAT_C_RESET << 16;
ehci->reset_done [wIndex] = 0;
/* force reset to complete */
ehci_writel(ehci, temp & ~(PORT_RWC_BITS | PORT_RESET),
status_reg);
/* REVISIT: some hardware needs 550+ usec to clear
* this bit; seems too long to spin routinely...
*/
retval = ehci_handshake(ehci, status_reg,
PORT_RESET, 0, 1000);
if (retval != 0) {
ehci_err (ehci, "port %d reset error %d\n",
wIndex + 1, retval);
goto error;
}
/* see what we found out */
temp = check_reset_complete (ehci, wIndex, status_reg,
ehci_readl(ehci, status_reg));
}
/* transfer dedicated ports to the companion hc */
if ((temp & PORT_CONNECT) &&
test_bit(wIndex, &ehci->companion_ports)) {
temp &= ~PORT_RWC_BITS;
temp |= PORT_OWNER;
ehci_writel(ehci, temp, status_reg);
ehci_dbg(ehci, "port %d --> companion\n", wIndex + 1);
temp = ehci_readl(ehci, status_reg);
}
/*
* Even if OWNER is set, there's no harm letting hub_wq
* see the wPortStatus values (they should all be 0 except
* for PORT_POWER anyway).
*/
if (temp & PORT_CONNECT) {
status |= USB_PORT_STAT_CONNECTION;
// status may be from integrated TT
if (ehci->has_hostpc) {
temp1 = ehci_readl(ehci, hostpc_reg);
status |= ehci_port_speed(ehci, temp1);
} else
status |= ehci_port_speed(ehci, temp);
}
if (temp & PORT_PE)
status |= USB_PORT_STAT_ENABLE;
/* maybe the port was unsuspended without our knowledge */
if (temp & (PORT_SUSPEND|PORT_RESUME)) {
status |= USB_PORT_STAT_SUSPEND;
} else if (test_bit(wIndex, &ehci->suspended_ports)) {
clear_bit(wIndex, &ehci->suspended_ports);
clear_bit(wIndex, &ehci->resuming_ports);
ehci->reset_done[wIndex] = 0;
if (temp & PORT_PE)
set_bit(wIndex, &ehci->port_c_suspend);
usb_hcd_end_port_resume(&hcd->self, wIndex);
}
if (temp & PORT_OC)
status |= USB_PORT_STAT_OVERCURRENT;
if (temp & PORT_RESET)
status |= USB_PORT_STAT_RESET;
if (temp & PORT_POWER)
status |= USB_PORT_STAT_POWER;
if (test_bit(wIndex, &ehci->port_c_suspend))
status |= USB_PORT_STAT_C_SUSPEND << 16;
if (status & ~0xffff) /* only if wPortChange is interesting */
dbg_port(ehci, "GetStatus", wIndex + 1, temp);
put_unaligned_le32(status, buf);
break;
case SetHubFeature:
switch (wValue) {
case C_HUB_LOCAL_POWER:
case C_HUB_OVER_CURRENT:
/* no hub-wide feature/status flags */
break;
default:
goto error;
}
break;
case SetPortFeature:
selector = wIndex >> 8;
wIndex &= 0xff;
if (unlikely(ehci->debug)) {
/* If the debug port is active any port
* feature requests should get denied */
if (wIndex == HCS_DEBUG_PORT(ehci->hcs_params) &&
(readl(&ehci->debug->control) & DBGP_ENABLED)) {
retval = -ENODEV;
goto error_exit;
}
}
if (!wIndex || wIndex > ports)
goto error;
wIndex--;
temp = ehci_readl(ehci, status_reg);
if (temp & PORT_OWNER)
break;
temp &= ~PORT_RWC_BITS;
switch (wValue) {
case USB_PORT_FEAT_SUSPEND:
if (ehci->no_selective_suspend)
break;
if ((temp & PORT_PE) == 0
|| (temp & PORT_RESET) != 0)
goto error;
/* After above check the port must be connected.
* Set appropriate bit thus could put phy into low power
* mode if we have tdi_phy_lpm feature
*/
temp &= ~PORT_WKCONN_E;
temp |= PORT_WKDISC_E | PORT_WKOC_E;
ehci_writel(ehci, temp | PORT_SUSPEND, status_reg);
if (ehci->has_tdi_phy_lpm) {
spin_unlock_irqrestore(&ehci->lock, flags);
msleep(5);/* 5ms for HCD enter low pwr mode */
spin_lock_irqsave(&ehci->lock, flags);
temp1 = ehci_readl(ehci, hostpc_reg);
ehci_writel(ehci, temp1 | HOSTPC_PHCD,
hostpc_reg);
temp1 = ehci_readl(ehci, hostpc_reg);
ehci_dbg(ehci, "Port%d phy low pwr mode %s\n",
wIndex, (temp1 & HOSTPC_PHCD) ?
"succeeded" : "failed");
}
if (ehci_has_fsl_susp_errata(ehci)) {
/* 10ms for HCD enter suspend */
spin_unlock_irqrestore(&ehci->lock, flags);
usleep_range(10000, 20000);
spin_lock_irqsave(&ehci->lock, flags);
}
set_bit(wIndex, &ehci->suspended_ports);
break;
case USB_PORT_FEAT_POWER:
if (HCS_PPC(ehci->hcs_params)) {
spin_unlock_irqrestore(&ehci->lock, flags);
ehci_port_power(ehci, wIndex, true);
spin_lock_irqsave(&ehci->lock, flags);
}
break;
case USB_PORT_FEAT_RESET:
if (temp & (PORT_SUSPEND|PORT_RESUME))
goto error;
/* line status bits may report this as low speed,
* which can be fine if this root hub has a
* transaction translator built in.
*/
if ((temp & (PORT_PE|PORT_CONNECT)) == PORT_CONNECT
&& !ehci_is_TDI(ehci)
&& PORT_USB11 (temp)) {
ehci_dbg (ehci,
"port %d low speed --> companion\n",
wIndex + 1);
temp |= PORT_OWNER;
} else {
temp |= PORT_RESET;
temp &= ~PORT_PE;
/*
* caller must wait, then call GetPortStatus
* usb 2.0 spec says 50 ms resets on root
*/
ehci->reset_done [wIndex] = jiffies
+ msecs_to_jiffies (50);
/*
* Force full-speed connect for FSL high-speed
* erratum; disable HS Chirp by setting PFSC bit
*/
if (ehci_has_fsl_hs_errata(ehci))
temp |= (1 << PORTSC_FSL_PFSC);
}
ehci_writel(ehci, temp, status_reg);
break;
/* For downstream facing ports (these): one hub port is put
* into test mode according to USB2 11.24.2.13, then the hub
* must be reset (which for root hub now means rmmod+modprobe,
* or else system reboot). See EHCI 2.3.9 and 4.14 for info
* about the EHCI-specific stuff.
*/
case USB_PORT_FEAT_TEST:
#ifdef CONFIG_USB_HCD_TEST_MODE
if (selector == EHSET_TEST_SINGLE_STEP_SET_FEATURE) {
spin_unlock_irqrestore(&ehci->lock, flags);
retval = ehset_single_step_set_feature(hcd,
wIndex + 1);
spin_lock_irqsave(&ehci->lock, flags);
break;
}
#endif
if (!selector || selector > 5)
goto error;
spin_unlock_irqrestore(&ehci->lock, flags);
ehci_quiesce(ehci);
spin_lock_irqsave(&ehci->lock, flags);
/* Put all enabled ports into suspend */
while (ports--) {
u32 __iomem *sreg =
&ehci->regs->port_status[ports];
temp = ehci_readl(ehci, sreg) & ~PORT_RWC_BITS;
if (temp & PORT_PE)
ehci_writel(ehci, temp | PORT_SUSPEND,
sreg);
}
spin_unlock_irqrestore(&ehci->lock, flags);
ehci_halt(ehci);
spin_lock_irqsave(&ehci->lock, flags);
temp = ehci_readl(ehci, status_reg);
temp |= selector << 16;
ehci_writel(ehci, temp, status_reg);
break;
default:
goto error;
}
ehci_readl(ehci, &ehci->regs->command); /* unblock posted writes */
break;
default:
error:
/* "stall" on error */
retval = -EPIPE;
}
error_exit:
spin_unlock_irqrestore (&ehci->lock, flags);
return retval;
}
EXPORT_SYMBOL_GPL(ehci_hub_control);
static void ehci_relinquish_port(struct usb_hcd *hcd, int portnum)
{
struct ehci_hcd *ehci = hcd_to_ehci(hcd);
if (ehci_is_TDI(ehci))
return;
set_owner(ehci, --portnum, PORT_OWNER);
}
static int ehci_port_handed_over(struct usb_hcd *hcd, int portnum)
{
struct ehci_hcd *ehci = hcd_to_ehci(hcd);
u32 __iomem *reg;
if (ehci_is_TDI(ehci))
return 0;
reg = &ehci->regs->port_status[portnum - 1];
return ehci_readl(ehci, reg) & PORT_OWNER;
}
static int ehci_port_power(struct ehci_hcd *ehci, int portnum, bool enable)
{
struct usb_hcd *hcd = ehci_to_hcd(ehci);
u32 __iomem *status_reg = &ehci->regs->port_status[portnum];
u32 temp = ehci_readl(ehci, status_reg) & ~PORT_RWC_BITS;
if (enable)
ehci_writel(ehci, temp | PORT_POWER, status_reg);
else
ehci_writel(ehci, temp & ~PORT_POWER, status_reg);
if (hcd->driver->port_power)
hcd->driver->port_power(hcd, portnum, enable);
return 0;
}